Malicious RTF — malware analysis report

Static analysis result for SHA-256 86ae4bb045ba106e…

MALICIOUS

RTF

5.6 KB First seen: 2017-09-14
MD5: 62fea3392afcadf3eb8aae42a7f5b881 SHA-1: b56ec5c3a36464ebb309ce109d76f352dce20d62 SHA-256: 86ae4bb045ba106e57c7e2d09e33dffb48cbc535605c9bb30218d94e3b6646f1
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an OLE object that is automatically linked and updated, exploiting CVE-2017-0199. This vulnerability is used to fetch and execute a secondary payload, specifically a default.hta file, from the IP address 168.206.245.4. The ClamAV detection 'Doc.Dropper.Agent-6362894-0' further confirms its dropper functionality.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • ClamAV: Doc.Dropper.Agent-6362894-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6362894-0
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://168.206.245.4:8080/default.hta In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000001b4.bin rtf-objdata-decoded RTF \objdata at offset 0x1B4 2601 bytes
SHA-256: 0c58de49060b3d84f5087257bcea057d84ec91c9f9df1bc278af95b422737f7d

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